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Select Analyze > Quality and Process > Control Chart > Multivariate Control Chart.

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Click OK.

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Initial Multivariate Control Chart for Thickness.jmp
The overall control chart in Initial Multivariate Control Chart for Thickness.jmp suggests that special causes affected bars 1, 2, 4, 5, and 22. Looking at the Principal Components report, you can see that almost 95% of the variation in the 12 thickness measurements is explained by the first principal component. You want to study the variation associated with this principal component further.
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From the red triangle menu, select T Square Partitioned.
